The optimum pH of yeast is between 5.2 - 5.5, which falls within the measuring capacity of the narrow-range Beer pH test strip (pH 4.6 - 6.2), to test for beer mash. Johnson Beer pH Strips pH 4.6 - 6.2 is both reliable and easy to read.
You are protected by the Consumer Contracts Regulations 2013 which give consumer buyers the right to cancel the purchase within 14 days of receiving the item. If you wish to cancel, please send an eBay message. Item must be unused, as per eBay's terms and conditions.